Black Friday 12.4 hours of mixed use (4850 + DBMD4 DSP) Battery, Continuous music playback time: Max. 30 hours(NC ON), Max. 40 hours(NC OFF) Continuous communication time: Max. 24 hours(NC ON), Max. 28 hours(NC OFF) Battery, up to 18 hours of normal use, up to 36 hours in Low Power Mode Battery